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The ATI Radeon drivers Ubuntu 9.10 installs by default should be the correct ones for your X1950xt.

I say should be because Ubuntu 9.10(beta) is giving me a lot of trouble on other fronts right now and I'm not able to test it against my system with the X1950xtx. I don't think it's anything major (and likely to sort itself over the next couple of update cycles) but I just haven't had time to work through it, yet.